Beta-limiting MHD Instabilities in Improved-performance NSTX Spherical Torus Plasmas

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Description

Global magnetohydrodynamic stability limits in the National Spherical Torus Experiment (NSTX) have increased significantly recently due to a combination of device and operational improvements. First, more routine H-mode operation with broadened pressure profiles allows access to higher normalized beta and lower internal inductance. Second, the correction of a poloidal field coil induced error-field has largely eliminated locked tearing modes during normal operation and increased the maximum achievable beta. As a result of these improvements, peak beta values have reached (not simultaneously) {beta}{sub t} = 35%, {beta}{sub N} = 6.4, <{beta}{sub N}> = 4.5, {beta}{sub N}/l{sub i} = 10, and {beta}{sub ... continued below

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2.6 MB pages

Creation Information

Menard, J.E.; Bell, M.G.; Bell, R.E.; Kaye, E.D. Fredrickson D.A. Gates: S.M.; LeBlanc, B.P.; Maingi, R. et al. May 29, 2003.

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Description

Global magnetohydrodynamic stability limits in the National Spherical Torus Experiment (NSTX) have increased significantly recently due to a combination of device and operational improvements. First, more routine H-mode operation with broadened pressure profiles allows access to higher normalized beta and lower internal inductance. Second, the correction of a poloidal field coil induced error-field has largely eliminated locked tearing modes during normal operation and increased the maximum achievable beta. As a result of these improvements, peak beta values have reached (not simultaneously) {beta}{sub t} = 35%, {beta}{sub N} = 6.4, <{beta}{sub N}> = 4.5, {beta}{sub N}/l{sub i} = 10, and {beta}{sub P} = 1.4. High {beta}{sub P} operation with reduced tearing activity has allowed a doubling of discharge pulse-length to just over 1 second with sustained periods of {beta}{sub N} {approx} 6 above the ideal no-wall limit and near the with-wall limit. Details of the {beta} limit scalings and {beta}-limiting instabilities in various operating regimes are described.

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2.6 MB pages

Notes

INIS; OSTI as DE00814017

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  • Other Information: PBD: 29 May 2003

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  • Report No.: PPPL-3815
  • Grant Number: AC02-76CH03073
  • Office of Scientific & Technical Information Report Number: 814017
  • Archival Resource Key: ark:/67531/metadc734932

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  • May 29, 2003

Added to The UNT Digital Library

  • Oct. 18, 2015, 6:40 p.m.

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  • April 15, 2016, 8:31 p.m.

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Menard, J.E.; Bell, M.G.; Bell, R.E.; Kaye, E.D. Fredrickson D.A. Gates: S.M.; LeBlanc, B.P.; Maingi, R. et al. Beta-limiting MHD Instabilities in Improved-performance NSTX Spherical Torus Plasmas, report, May 29, 2003; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc734932/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.